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Linux/arch/mips/sni/reset.c

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  1 /*
  2  *  linux/arch/mips/sni/process.c
  3  *
  4  *  Reset a SNI machine.
  5  */
  6 #include <linux/delay.h>
  7 
  8 #include <asm/io.h>
  9 #include <asm/reboot.h>
 10 #include <asm/sni.h>
 11 
 12 /*
 13  * This routine reboots the machine by asking the keyboard
 14  * controller to pulse the reset-line low. We try that for a while,
 15  * and if it doesn't work, we do some other stupid things.
 16  */
 17 static inline void kb_wait(void)
 18 {
 19         int i;
 20 
 21         for (i = 0; i < 0x10000; i++)
 22                 if ((inb_p(0x64) & 0x02) == 0)
 23                         break;
 24 }
 25 
 26 /* XXX This ends up at the ARC firmware prompt ...  */
 27 void sni_machine_restart(char *command)
 28 {
 29         int i;
 30 
 31         /* This does a normal via the keyboard controller like a PC.
 32            We can do that easier ...  */
 33         local_irq_disable();
 34         for (;;) {
 35                 for (i = 0; i < 100; i++) {
 36                         kb_wait();
 37                         udelay(50);
 38                         outb_p(0xfe, 0x64);      /* pulse reset low */
 39                         udelay(50);
 40                 }
 41         }
 42 }
 43 
 44 void sni_machine_power_off(void)
 45 {
 46         *(volatile unsigned char *)PCIMT_CSWCSM = 0xfd;
 47 }
 48 

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